// vue.config.js 是脚手架的配置文件; 修改了必须重启项目
// 使用js的严格模式， 注意：严格模式下 this如果指向undefined，说明指向window
"use strict";
// 导入nodejs的path模块
const path = require("path");
// 导入src下面的settings.js的配置
const defaultSettings = require("./src/settings.js");
//  将相对路径转为绝对路径
function resolve(dir) {
  return path.join(__dirname, dir);
}
// 定义网页的标题
const name = defaultSettings.title || "vue Admin Template"; // page title

// 设置项目运行的端口(读取环境变量里面的prot，如果没有读取packagejson里面的port，如果还没有使用9528)
const port = process.env.port || process.env.npm_config_port || 9528; // dev port

// 定义配置  https://cli.vuejs.org/config/
module.exports = {
  // 资源引用路径
  publicPath: "/",
  // 打包输出目录
  outputDir: "dist",
  // 打包静态文件目录
  assetsDir: "static",
  // 是否开启代码校验
  lintOnSave: process.env.NODE_ENV === "development",
  // 是否关闭map文件
  productionSourceMap: false,
  // 开发服务器介绍
  devServer: {
    port: port, // 端口号
    open: false, // 运行好了之后是否自动打开浏览器
    overlay: {
      warnings: false,
      errors: true,
    },
    proxy: {
      //#region
      /*
       '/地址':{
          target:"跨域目标地址",
          changeOrigin:true  // 是否需要跨域
          pathRewrite:{   // 路径是否重写
            '^/地址': ''
          }
       }
       */
      //#endregion
      "/api": {
        // target: "http://ihrm-java.itheima.net/", // 跨域请求的地址
        target: "http://ihrm.itheima.net/", // 跨域请求的地址 【使用这个】
        changeOrigin: true, // 只有这个值为true的情况下 才表示开启跨域
      },
    },
    // 注释掉这一句！
    // before: require("./mock/mock-server.js"),
  },
  // webpack的配置【对象式配置】
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name, // 网页标题
    resolve: {
      // 路径解析
      alias: {
        "@": resolve("src"), // 如果遇到@src进行解析为根目录的scr目录
      },
    },
  },
  // webpack的配置【函数式配置】
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin("preload").tap(() => [
      {
        rel: "preload",
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: "initial",
      },
    ]);

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete("prefetch");

    // set svg-sprite-loader
    config.module.rule("svg").exclude.add(resolve("src/icons")).end();
    config.module
      .rule("icons")
      .test(/\.svg$/)
      .include.add(resolve("src/icons"))
      .end()
      .use("svg-sprite-loader")
      .loader("svg-sprite-loader")
      .options({
        symbolId: "icon-[name]",
      })
      .end();

    config.when(process.env.NODE_ENV !== "development", (config) => {
      config
        .plugin("ScriptExtHtmlWebpackPlugin")
        .after("html")
        .use("script-ext-html-webpack-plugin", [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/,
          },
        ])
        .end();
      config.optimization.splitChunks({
        chunks: "all",
        cacheGroups: {
          libs: {
            name: "chunk-libs",
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: "initial", // only package third parties that are initially dependent
          },
          elementUI: {
            name: "chunk-elementUI", // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/, // in order to adapt to cnpm
          },
          commons: {
            name: "chunk-commons",
            test: resolve("src/components"), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true,
          },
        },
      });
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk("single");
    });
  },
};
